Elastic metal stringing and method of making the same



Dec. 4, 1928.- 5 1,694,360

W. A. LARNED ELASTIC METAL STRINGING AND METHOD OF MAKING THE SAME Original Filed Feb. 13. 1922 gmwnlfow, v

[Ma i I 9251 M (id om Patented Dec. 4, 1928.

UNETE WILLIAM A. LARNED, OF SUMMIT, NEXV JERSEY, ASSIGNOR 'TO THE DAYTON STEEL RACQUET COMPANY, OF DAYTON, OHIO, A CORPORATION OF OHIO.

ELASTIC METAL STRING-INC} AND METHOD OF MAKING THE SAME.

Original application filed February 13, 1922, Serial No. 536,135, and in France March 20, 1922. Divided and this application filed May 22, 1922. Serial No. 562,718.

The object of the invention illustrated and described in this application, which is a division of my application Serial No. 536,135 filed February 13th, 1922, is to provide for tennis rackets and other uses, an elastic. metalstringing which comprises two or more wires. These wires are wound to form a helix of a number of coils that are thereafter adapted to be stretched or extended by a. force to reduce the number of their coils per inch, or the diameter of said coils.

The method which 1 preferably employ for forming av metal stringing of the desired elasticity, weight and stiffness, consists in first winding two or more wires around a central core or an imaginary cylinder to form a helix of a number of coils per inch. These coiled wires are then extended by any suitable means, or when being inserted in a tennis racket frame or other structure, to impart to them the desired degree of elasticity, stifiness and weight.

In the accompanying drawings, Figure 1 is a plan. view of a portion of a tennis racket containing my elastic metal-stringing. Figure 2 is a side view of two wires wound close together to form. a helix having a large number of coils per inch. Figure 3 is a cross section taken through the same. Figure l is a side View of the same wires after they have been extended by a force to reduce the numb er of coils per inch. And Figure 5 is a cross section taken through the same.

Throughout the specification and drawings, similar reference characters denote corresponding parts.

In Figures 2 and 3, the numerals l and 2' designate two wires of suitable material that are wound around a central core or an imaginary cylinder, preferably in such a manner that they will follow one another around in close contact, to form a helix of a number of coils per inch. These two wires, or any number of wires so wound, are then stretched by any suitable means, or when being inserted in a. tennis racket frame or other structure, to reduce the diameter of said coils, or their number per inch, to impart to these wires the desired degree of elasticity, weightand stiffness for the use to which they are put. (See- Figures 8 and 4:)

In Figure 1 these wires so wound and stretched, are shown as constituting a. stringing 3 for a tennis racket frame 4, where they will easily give or yield when extended under the impetus of the ball, and thereafter readily return to their original form. When extended under the action of a. force, the coiled strands will decrease in diameter to give to the stringing which they constitute, the desired resiliency for their use in a tennis racket or other structure.

Having described my invention, I claim: I

1. An elastic metal stringing comprising a number of wires that are first wound to form a helix of a number of coils per inch, and thereafter extended in the direction of the axis of said coils to reduce the number of the latter per inch to give to the stringing the degree of stiffness, weight and elasticity required for the use to which it is put.

2. The method of making an elastic metal stringing which consists first in winding a number of wires to form av helix of'a number of coils per inch, and thereafter extending said wires in thedirection of the axis oft-heir coils to reduce the number of the latter per inch before employing the stringing for the use to which it is put. a

3. As an article of manufacture, a plurality of coiled lengths of wire, each of said lengths being stretched to permanently deform the coils thereof, and each of said lengths being interlocked with the coils of another length.

4. A stringing'for tennis rackets or the like comprising a plurality of coiled lengths of wire, the coils of said lengths being stretched to permanently deform them, and the coils of said lengths'being interlocked to form a group.

5. An elastic metal stringing comprising a number of wires that are wound together and then stretched to a point beyond which they will torsionally react upon each other to give maintained elasticity under the action of a force. V

6. The method of making an elastic metal stringing, which consists, first, in winding a number of Wires together to leave a hoilew center, and then stretching said Wires to a point beyond which theywill torsionally react upon each other to give maintained elasticity under the action of a force.

7. The method of making an elastic metalstringing of a desired stiffness, Weight and elasticity, Which consists first in Winding a number of Wires to form a helix of a number XVILLIAM A. LARNED. 

